aboutsummaryrefslogtreecommitdiffstats
path: root/code/asm/snd_mixa.s
blob: 4c6be5b775499b3c20d955a07c109d8be7733ca4 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
/*
===========================================================================
Copyright (C) 1999-2005 Id Software, Inc.

This file is part of Quake III Arena source code.

Quake III Arena source code is free software; you can redistribute it
and/or modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the License,
or (at your option) any later version.

Quake III Arena source code is distributed in the hope that it will be
useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with Foobar; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
===========================================================================
*/
//
// snd_mixa.s
// x86 assembly-language sound code
//

#include "qasm.h"

#if	id386

	.text

#if 0 
//----------------------------------------------------------------------
// 8-bit sound-mixing code
//----------------------------------------------------------------------

#define ch		4+16
#define sc		8+16
#define count	12+16

.globl C(S_PaintChannelFrom8)
C(S_PaintChannelFrom8):
	pushl	%esi				// preserve register variables
	pushl	%edi
	pushl	%ebx
	pushl	%ebp

//	int 	data;
//	short	*lscale, *rscale;
//	unsigned char *sfx;
//	int		i;

	movl	ch(%esp),%ebx
	movl	sc(%esp),%esi

//	if (ch->leftvol > 255)
//		ch->leftvol = 255;
//	if (ch->rightvol > 255)
//		ch->rightvol = 255;
	movl	ch_leftvol(%ebx),%eax
	movl	ch_rightvol(%ebx),%edx
	cmpl	$255,%eax
	jna		LLeftSet
	movl	$255,%eax
LLeftSet:
	cmpl	$255,%edx
	jna		LRightSet
	movl	$255,%edx
LRightSet:

//	lscale = snd_scaletable[ch->leftvol >> 3];
//	rscale = snd_scaletable[ch->rightvol >> 3];
//	sfx = (signed char *)sc->data + ch->pos;
//	ch->pos += count;
	andl	$0xF8,%eax
	addl	$20,%esi
	movl	(%esi),%esi
	andl	$0xF8,%edx
	movl	ch_pos(%ebx),%edi
	movl	count(%esp),%ecx
	addl	%edi,%esi
	shll	$7,%eax
	addl	%ecx,%edi
	shll	$7,%edx
	movl	%edi,ch_pos(%ebx)
	addl	$(C(snd_scaletable)),%eax
	addl	$(C(snd_scaletable)),%edx
	subl	%ebx,%ebx
	movb	-1(%esi,%ecx,1),%bl

	testl	$1,%ecx
	jz		LMix8Loop

	movl	(%eax,%ebx,4),%edi
	movl	(%edx,%ebx,4),%ebp
	addl	C(paintbuffer)+psp_left-psp_size(,%ecx,psp_size),%edi
	addl	C(paintbuffer)+psp_right-psp_size(,%ecx,psp_size),%ebp
	movl	%edi,C(paintbuffer)+psp_left-psp_size(,%ecx,psp_size)
	movl	%ebp,C(paintbuffer)+psp_right-psp_size(,%ecx,psp_size)
	movb	-2(%esi,%ecx,1),%bl

	decl	%ecx
	jz		LDone

//	for (i=0 ; i<count ; i++)
//	{
LMix8Loop:

//		data = sfx[i];
//		paintbuffer[i].left += lscale[data];
//		paintbuffer[i].right += rscale[data];
	movl	(%eax,%ebx,4),%edi
	movl	(%edx,%ebx,4),%ebp
	addl	C(paintbuffer)+psp_left-psp_size(,%ecx,psp_size),%edi
	addl	C(paintbuffer)+psp_right-psp_size(,%ecx,psp_size),%ebp
	movb	-2(%esi,%ecx,1),%bl
	movl	%edi,C(paintbuffer)+psp_left-psp_size(,%ecx,psp_size)
	movl	%ebp,C(paintbuffer)+psp_right-psp_size(,%ecx,psp_size)

	movl	(%eax,%ebx,4),%edi
	movl	(%edx,%ebx,4),%ebp
	movb	-3(%esi,%ecx,1),%bl
	addl	C(paintbuffer)+psp_left-psp_size*2(,%ecx,psp_size),%edi
	addl	C(paintbuffer)+psp_right-psp_size*2(,%ecx,psp_size),%ebp
	movl	%edi,C(paintbuffer)+psp_left-psp_size*2(,%ecx,psp_size)
	movl	%ebp,C(paintbuffer)+psp_right-psp_size*2(,%ecx,psp_size)

//	}
	subl	$2,%ecx
	jnz		LMix8Loop

LDone:
	popl	%ebp
	popl	%ebx
	popl	%edi
	popl	%esi

	ret


#endif

//----------------------------------------------------------------------
// Transfer of stereo buffer to 16-bit DMA buffer code
//----------------------------------------------------------------------

.globl C(S_WriteLinearBlastStereo16)
C(S_WriteLinearBlastStereo16):
	pushl	%edi
	pushl	%ebx

//	int		i;
//	int		val;
	movl	C(snd_linear_count),%ecx
	movl	C(snd_p),%ebx
	movl	C(snd_out),%edi

//	for (i=0 ; i<snd_linear_count ; i+=2)
//	{
LWLBLoopTop:

//		val = (snd_p[i]*snd_vol)>>8;
//		if (val > 0x7fff)
//			snd_out[i] = 0x7fff;
//		else if (val < (short)0x8000)
//			snd_out[i] = (short)0x8000;
//		else
//			snd_out[i] = val;
	movl	-8(%ebx,%ecx,4),%eax
	sarl	$8,%eax
	cmpl	$0x7FFF,%eax
	jg		LClampHigh
	cmpl	$0xFFFF8000,%eax
	jnl		LClampDone
	movl	$0xFFFF8000,%eax
	jmp		LClampDone
LClampHigh:
	movl	$0x7FFF,%eax
LClampDone:

//		val = (snd_p[i+1]*snd_vol)>>8;
//		if (val > 0x7fff)
//			snd_out[i+1] = 0x7fff;
//		else if (val < (short)0x8000)
//			snd_out[i+1] = (short)0x8000;
//		else
//			snd_out[i+1] = val;
	movl	-4(%ebx,%ecx,4),%edx
	sarl	$8,%edx
	cmpl	$0x7FFF,%edx
	jg		LClampHigh2
	cmpl	$0xFFFF8000,%edx
	jnl		LClampDone2
	movl	$0xFFFF8000,%edx
	jmp		LClampDone2
LClampHigh2:
	movl	$0x7FFF,%edx
LClampDone2:
	shll	$16,%edx
	andl	$0xFFFF,%eax
	orl		%eax,%edx
	movl	%edx,-4(%edi,%ecx,2)

//	}
	subl	$2,%ecx
	jnz		LWLBLoopTop

//	snd_p += snd_linear_count;

	popl	%ebx
	popl	%edi

	ret

#endif	// id386